Tool holder for two-way planing



Oct. 1, G. BRUNNER TOOL HOLDER FOR TWO-WAY PLANING Filed Sept. 27, 19342 Sheets-Sheet l Oct. 1, 1935. G. BRUNNER TOOL HOLDER FOR TWO-WAYPLANING Filed Sept. 27, 1954 2 Sheets-Sheet 2 Patented Oct. 1, 1935UNITED STATES PATENT OFFICE Application September 2'7, 1934, Serial No.745,748 In Switzerland October 3, 1933 4 Claims.

This invention relates, generally, to improvements in toolorcutter-heads of planers or shapers embodying a single double-facedcutting tool, and, more particularly, to a method of suspen- 6 sion ofsuch heads, which, in combination with a plurality of auxiliary deviceson both head and head-carrier, allows an automatic setting of thetool-head into its correct position for each operative run.

The objects of my invention are, first, to make use of but one cuttingtool; second, to afford facili ties for the automatic setting of thetool-head into its correct position for each operative return run; and,third, to suspend the tool-head in its carrier in such a way, which, incombination with a set of stop-faces on both head and carrier, allowsgreat chip-areas with a positive and steady operative action of the toolitself.

I am aware that it has been proposed before to adapt tool-holders fortwo-way planing with a double-faced steel. The resetting of the tool atthe end of an operative run into its correct position for the returnoperative run was then effected by way of supporting the holder on ahorizontal axis, either at half its height or lower still; such anarrangement being, however, of disadvantage, as the pivot then isexcessively loaded and the tool itself is subjected to excessive bendingstresses, which factors combined result in relatively small chip-areas,as otherwise the tool would begin to oscillate while in action.

Again it has been proposed to allow the toolhead not only to swing abouta horizontal but also about its longitudinal axis, so as to give thetool its correct operative setting by means of a special lever-systeminvolving a special switch on the planer.

With the present invention the holder in its carrier is allowed apendulous motion releasing the swing of the holder for setting theclearance angle, the latter being the angular displacement of the tool,or its holder, about its longitudinal axis and is measured in a planeatright angles to said axis. In this way a much more simple anddependable construction of the toolholder and appurtenant devices isassured, independent of any special switch lever-system.

I attain aforementioned objects by the mechanism illustrated in theaccompanying drawings, in which Fig. 1 is a side elevation of thetool-holder and appurtenant devices, partly in vertical section;

Fig. 2, a section along line 0-0 of Fig. 1;

Fig. 3, a side elevation of the cutting tool;

Fig. 4, a front elevation of same;

Figs. 5-9, side elevations of the cutting tool at various longitudinaland horizontal angular displacements, illustrating the pendulous motionsof the tool-holder at the start, during, and at the end of its operativerun;

Figs. l0-13, side elevations at four different tool-settings, which maybe effected without resetting the tool in its holder, and where for thesake of clearness a single-faced tool is illustrated; 10

Figs. 14-18, horizontal sections of the toolholder and referringrespectively to Figs. 5-9 lying immediately above.

Similar letters refer to similar parts throughout the several views.

20 is part of the head-carrier standard, with frame I and two bearings min a fixed position. Collar d, to which tool-holder a is attached, issuspended from bearings m by means of a horizontal pivot n and also avertical pivot e, and 20 thus is freely revolvable both vertically andhorizontally.

Tool-holder a, essentially of a cylindrical shape, carries a hand-Wheelg for swinging the holder about its longitudinal axis for for a purposedescribed subsequently. The double suspension ne allows holder a toswing in a pendulous motion from the horizontal pivot 11. and a freedisplacement around its longitudinal axis on pivot 6. Tool 1),possessing a double-faced cutting edge according to Figs. 3 and 4, issecured in its holder 0. by usual set-screws o. Tool-holder a freelypasses through an opening in frame I and is guided by two of the lattersinner faces. Two springs pushing up against a ring '0 carried aroundholder a, and bearing on frame I or respectively on part w of itssupport, are aiming to stop said pendulous motion of holder a and arrestthe latter in the mean position according to Fig. 1. The lower part ofholder a possesses two check-faces p and p1, lying vertical in thenormal position according to Figs. 1, 2 and 5 and in planes includingequal horizontal angles with an axial plane II (Figs. 1 and 2). In theopening of frame I I have another pair of 45 check-faces q and q1, lyingin planes including equal vertical angles with said axial plane II andwith their upper and lower marginal edges parallel to the latter.Check-face a1 forms one side of a stop 0 which is horizontallyadjustable 50 by means of a threaded spindle and a handwheel 71..

On the upper side of frame I, on the four corners of the frame-openingand at the same height, I have four horizontally adjustable 5 stops k,each possessing two corners hi and k2 and between these latter a recessk3. On one axial half of holder a, on one side of a vertical axial planeIIII, there are two stops 1' lying symmetrically to either side of axialplane II and which may co-operate with adjacent stops it of theframe-opening. Turning holder a. for 180 about its longitudinal axis bymeans of handwheel 9, the two stops 2' can co-operate with the twoframe-stops 7c lying to the front of axial plane IIH of Fig. 2.

The operation of this tool-holder, according to Figs. 5-9 and theircompanionFigs. 14-18, is the following:

Suppose horizontal planing starts at the forward run: holder a,according to Fig. 5, is hanging in its mean position and tends to swingin the direction of arrow 02. The cutting tool b now pushes up againstwork-piece A, whereby toolholder a oscillates around pivot 12 in thedirection of arrow y into an intermediate position shown in Fig. 6. Now,toward the end of the pendulous motion, face i1 of stop 2 (Fig. ispushing against corner I02 and thus turns holder at for the amount ofangle or around its longitudinal axis into the final and workingposition of Figs. 7 and 16, when stop 1' has entered the recess k2.Check-face 121 now is abutting solidily and squarely against the countercheck-face 1 of the frame-opening so that cutter b then is secured inits correct setting of the clearanceangle or against a further turningabout and pendulous motion. Springs (Figs. 1 and 2) damper the stoppingmotion. In the position of Figs. 8 and 17 tool I is getting off thework-piece A, thus releasing the pressure of faces p1 and (11 againsteach other and thus also releasing springs 1. Edge 2'1 (Figs. 9 and 18)now pushes up against corner in, thus turning tool-holder a back aboutits longitudinal axis into the mean position of Figs. 5 and 14, withsprings f supporting this return movement. The play now is reversed in adirection opposite to that of the initial forward run, with the otherstop 2' co-operating with the other stop it, whereby both stops lie tothe same side of axial planes II and II-II. v

I thus am able, with the tool-holder of the present invention incombination with its appurtenant devices, to plane from the left to theright (Fig. 10) or vice versa (Fig. 11) without taking the tool out ofits holder or resetting it; or, again, in a perpendicular directioneither on the left (Fig. 12) or on the right side (Fig. 13); wherebymuch work of dismantling and resetting the tool is eliminated, such workbeing necessary on planers with dead backward runs. A resetting with theplaner in operation is possible with the present invention.

A principal advantage of the tool-holder at hand lies in the arrangementof the pendulumjoint en on its head in connection with the wide andsubstantial stop-faces p, q, 191 and (11 on its bottom-part, as herebythe bending stresses on the tool are kept small; the latter thereforedoes not start oscillating and thus allows be the planing of relativelygreat chip-areas. The wide stopfaces easily take up the working pressurewithout giving rise to harmful turning moments in the tool and withoutsubjecting the latter to torsional vibrations. a higher planing speed.The stops k and i render complicated steering mechanisms, with theirmany attending troubles, unnecessary, allowing me by way of thependulous motion of the toolholder to directly release the latterssetting onto 10 the clearance-angle.

I claim:

1. In a toolor cutter-head for two-way planing a tool-holder incombination with a sliding head, said tool-holder having a pendulous l5suspension around a horizontal axis of said sliding head at its top, adouble-faced tool or cutter set in said tool-holder, said tool-holderbeing mounted rotatively around its longitudinal axis, stop-elements insaid tool-holder and counterstops in'said sliding head, the latter lyingin the path of the former when said tool-holder swings about saidhorizontal axis.

2. In a toolor cutter-head a tool-holder in combination with a slidinghead, a tool-holder revolvably suspended from a horizontal axis of saidsliding head at its top, a double-faced tool or cutter set in saidtool-holder, said tool-holder aiso being revolva'oly mounted around itslongitudinal axis, stop-elements on said tool-holder and co-unterstopson said sliding head, the latter lying in the path of the former whensaid tool holder swings about said horizontal axis, and verticalstop-faces on two opposite sides of said toolhoider lying askew to eachother and counterstop-faces on said sliding head tapering, relative toeach other, outward from top to bottom.

3. In a toolor cutter-head for two-way plana tool-holder in combinationwith a sliding head, said tool-holder being rotatively mounted 0 on ahorizontal axis of said sliding head at its top, a double-faced tool orcutter set in said toolholder, said tool-holder furthermore beingrotatively mounted about its longitudinal axis, stop-elements on saidtool-holder and counterstops on said sliding head, the latter lying inthe path of the former when said tool-holder swings about saidhorizontal axis, vertical stop-faces on two opposite sides of saidtool-holder lying askew to each other and counterstop-faces on said inga tool-holder in combination with a sliding head, said tool-holder beingrotatively mounted on a horizontal axis of said sliding head at its top,a double-faced tool or cutter set in said toolholder, said tool-holderalso being mounted rotatively about its longitudinal axis and adjustablefor 188 around the latter axis, two stopcams on said tool-holder andfour stop-elements on said sliding head.

GEORGES ERUNNER.

All these factors combined makes for 5

